Axial-through Marine Permanent Magnet Shaft Generator and Assembly Process

Abstract

The present invention discloses an axial-through marine permanent magnet shaft generator, which includes a generator stator housing, a generator stator winding, a generator permanent magnet rotor, a cylindrical rotor bracket and a central rotating shaft that are coaxial; the generator stator winding is on the inner wall of the generator stator housing, and the generator permanent magnet rotor is coaxially fixed to the outer wall of the cylindrical rotor bracket; a flange ring wall is integrally provided on the inner wall of the cylindrical rotor bracket; a stator-rotor chamber is formed between the generator stator housing and the cylindrical rotor bracket; a flange plate is integrally coaxially provided in the middle of the central rotating shaft, and the flange plate is synchronously connected to the flange ring wall coaxially through a plurality of flange bolts, enabling the precise and efficient assembly process of a large marine axial-through generator to be smoothly implemented.

Description

Technical Field

[0001] The present invention belongs to the field of marine generators. Background Art

[0002] With the development of the global economy, the development and utilization of marine resources have been increasingly emphasized. As a means of transportation on the sea, the performance and reliability of the power plant of a ship are of great significance to shipping safety and economic benefits. As a core component of the ship's power plant, a marine shaft generator (hereinafter referred to as shaft generator or generator) directly affects the power output and operating efficiency of the ship. Among various forms of shaft generators, due to the characteristics of low-speed permanent magnet shaft generators such as no need for electric excitation, high efficiency, no gearbox, high reliability, and wide adaptability, they have become the first choice for marine shaft generators in recent years.

[0003] Since the permanent magnet through-shaft generator shares the main shaft with the ship's main shaft, the shaft generator itself has no bearings and cannot operate independently, and its assembly process is complex, which restricts its development in the marine market. In view of this, our company has developed a structure and process flow of a permanent magnet through-shaft generator that can be safely, quickly installed and disassembled, which is of great significance for improving the technical level of permanent magnet shaft generators in ship power plants and reducing operating costs;

[0004] At the same time, in practice, the indoor temperature in the generator compartment and diesel engine compartment of a ship is very high itself. At the same time, due to requirements such as rain protection, both this device and the diesel engine are arranged in an independent small-volume cabin in the same space. Due to its own heat dissipation and the heat dissipation of the diesel engine, the ambient temperature where the generator itself is located is relatively high, which in turn affects the heat dissipation efficiency of the generator during high-speed operation. Summary of the Invention

[0005] Object of the Invention: In order to overcome the deficiencies in the prior art, the present invention provides a through-shaft marine permanent magnet shaft generator and an assembly process, which can smoothly implement a precise and efficient assembly process.

[0006] Technical Solution: To achieve the above object, the through-shaft marine permanent magnet shaft generator of the present invention includes a generator stator housing, a generator stator winding, a generator permanent magnet rotor, a cylindrical rotor bracket, and a central rotating shaft that are coaxial;

[0007] The generator stator winding is on the inner wall of the generator stator housing, and the generator permanent magnet rotor is coaxially fixed to the outer wall of the cylindrical rotor bracket; a flange ring wall is integrally provided on the inner wall of the cylindrical rotor bracket; a stator-rotor chamber is formed between the generator stator housing and the cylindrical rotor bracket; a flange plate a is integrally coaxially provided in the middle of the central rotating shaft, and the flange plate a and the flange ring wall are coaxially and synchronously connected by a plurality of flange bolts.

[0008] Further, both ends of the central rotating shaft are integrally and coaxially connected with a b flange and a c flange respectively; the outer diameters of the b flange and the c flange are both smaller than the inner diameter of the flange ring wall.

[0009] Further, it also includes a diesel engine output shaft and a propeller shaft. A d flange is integrally and coaxially arranged at the end of the diesel engine output shaft. One end of the propeller shaft is integrally and coaxially provided with an e flange, and the other end is connected to a propeller unit; the b flange and the d flange are coaxially and synchronously connected by a number of flange bolts; the c flange and the e flange are coaxially connected by flange bolts.

[0010] Further, end cover installation inner stops are provided at both ends of the inner wall of the generator stator housing. Two inner support ring end covers are coaxially arranged at both ends of the generator stator housing. The outer rings of the two inner support ring end covers are respectively snapped into the inner stops at both ends of the inner wall of the generator stator housing; a copper ring is coaxially and fixedly connected to the inner ring of the inner support ring end cover through a flange, and a gap is formed between the inner ring of the copper ring and the outer wall surface of the cylindrical rotor bracket.

[0011] Further, a number of ventilation holes are hollowed out on the inner support ring end cover. There are a cooling water inlet interface and a cooling water outlet interface on the generator stator housing. There is a cooling water channel in the generator stator housing, and both ends of the cooling water channel are respectively communicated with the water inlet interface and the cooling water outlet interface.

[0012] Further, it also includes annular process end covers that can be installed at both ends of the generator stator housing. Inner ring flange holes and outer ring flange holes are respectively arranged on the inner and outer rings of the annular process end covers; the outer ring flange holes on the outer ring of the annular process end cover are detachably locked at the end of the generator stator housing through flange bolts; the inner ring flange holes on the inner ring of the annular process end cover are detachably locked at the end of the cylindrical rotor bracket through flange bolts.

[0013] Further, the assembly process of the shaft-through marine permanent magnet shaft generator:

[0014] Step 1, knock the outer ring of an inner support ring end cover coaxially into the inner stop at any end of the inner wall of the generator stator housing.

[0015] Step 2, take the side where an inner support ring end cover has been knocked in as the lower side, and place the generator stator housing with the generator stator winding installed vertically on the tooling table.

[0016] Step 3, lift the integrated structure composed of the cylindrical rotor bracket and the generator permanent magnet rotor from above into the inner circle of the generator stator winding until the lower end of the cylindrical rotor bracket passes through the copper ring in the inner circle of the lower inner support ring end cover.

[0017] Step 4, assemble the other inner support ring end cover with a copper ring from above.

[0018] Step Five: Turn the assembly structure obtained in "Step Four" to the horizontal state;

[0019] Step Six: Lock the outer flange holes of the outer rings of the two annular process end covers to both ends of the generator stator housing through flange bolts in a detachable manner; at the same time, lock the inner flange holes of the inner rings of the two annular process end covers to both ends of the cylindrical rotor bracket through flange bolts in a detachable manner; at this time, a fixed body that is strictly constrained among the two annular process end covers, the generator stator housing, and the cylindrical rotor bracket is formed. Meanwhile, under the rigid constraint of the flange connection of the two annular process end covers, the copper ring inner circles of the two inner support ring end covers and the cylindrical rotor bracket automatically enter the coaxial state, and a gap of 1 ± 0.25 mm is automatically formed between them; meanwhile, the stator-rotor chamber is closed by the two annular process end covers, and the protection level reaches IP55;

[0020] Step Seven: Insert the central rotating shaft into the inner circle of the cylindrical rotor bracket, and then lock the a flange plate and the flange ring wall through a number of flange bolts; then prepare to lift it into the cabin;

[0021] Step Eight: Lock the b flange plate and the d flange plate coaxially through a number of flange bolts; lock the c flange plate and the e flange plate coaxially through a number of flange bolts; at the same time, adjust the position of the generator stator housing adaptively; then remove the two annular process end covers, measure the gap between the copper ring inner circle of the inner support ring end cover and the cylindrical rotor bracket at 4 positions up, down, left, and right in the circumference. If there is any deviation, it can be finely adjusted through the jacking screw holes on the machine base feet; after the measurement is qualified, firmly fix the generator stator housing;

[0022] Step Nine: In the extreme case of stator short circuit, remove the bolts connecting the a flange plate and the flange ring wall, and axially push out the cylindrical rotor bracket a certain distance. At this time, the rotor is disengaged from the central rotating shaft.

[0023] Furthermore, for the improvement scheme of the cooling structure of the shaft-through marine permanent magnet shaft generator, a number of cold air outlets are distributed on the outer wall surface of the cylindrical rotor bracket. The a number of cold air outlets are circumferentially arrayed at both ends of the generator permanent magnet rotor and are all communicated with the stator-rotor chamber;

[0024] Inside the a flange, several a gas centrifugal channels extending in the radial direction are distributed in a circumferential array. Inside the integrated structure formed by the cylindrical rotor bracket and the flange ring wall, several b centrifugal channels are distributed in a circumferential array. One end of each of the several b centrifugal channels away from the axis of the cylindrical rotor bracket is connected to the stator-rotor chamber through several cold air outlets. When the a flange and the flange ring wall are tightly connected by a flange, one end of each of the several a gas centrifugal channels away from the axis of the a flange corresponds to and is connected to one end of each of the several b centrifugal channels close to the axis of the cylindrical rotor bracket; at the axis center inside the a flange, a ring-shaped gas distribution chamber is coaxially arranged. One end of each of the several a gas centrifugal channels close to the axis of the a flange is connected to the ring-shaped gas distribution chamber. An a-section air intake channel is arranged along the length direction inside the central shaft. One end of the a air intake channel close to the b flange is connected to the external atmospheric pressure through an air inlet; a b-section air intake channel is arranged along the length direction inside the propeller shaft. When the c flange and the e flange are tightly connected by a flange, one end of the a-section air intake channel and one end of the b-section air intake channel close to each other are connected; a c-section air intake channel parallel to the b-section air intake channel is arranged along the length direction inside the propeller shaft. A d-section air intake channel parallel to the a-section air intake channel is arranged along the length direction inside the central shaft; when the c flange and the e flange are tightly connected by a flange, one end of the c-section air intake channel and one end of the d-section air intake channel close to each other are connected;

[0025] Inside the propeller hub or propeller blade of the propeller unit, a zigzag gas cooling channel is arranged. One end of the b-section air intake channel and one end of the c-section air intake channel close to the propeller unit are connected to each other through the zigzag gas cooling channel.

[0026] Beneficial effects: The present invention provides a quickly installable and detachable permanent magnet through-shaft type shaft generator structure and technological process, which is of great significance for improving the technical level of permanent magnet shaft generators in ship power plants and reducing operating costs;

[0027] Especially in "Step Six", with the help of the process end cover, the inner copper ring of the inner support ring end cover and the cylindrical rotor bracket automatically enter the coaxial state and form a specific gap, and then in "Step Eight", the process end cover is disassembled; enabling the stator and rotor to resume the relative rotation relationship under the coaxial condition; its technological process is ingenious, enabling the smooth and precise assembly of the device;

[0028] At the same time, with the improved air duct cooling circulation system, the air continuously blown out from the several cold air outlets to the stator-rotor chamber is the relatively cold air efficiently cooled by the propeller blades. Therefore, during the operation of the machine, the stator-rotor chamber of the device is continuously replenished with cold air, thereby significantly promoting the cooling and heat dissipation of the motor stator winding and the stator-rotor chamber. Description of the Drawings

[0029] Figure 1This is a schematic diagram of the overall structure of the generator. In this figure, the process end cover is not disassembled;

[0030] Figure 2 It is a schematic diagram after disassembling the process end cover on the basis of Figure 1 ;

[0031] Figure 3 Cross-sectional views of the generator before and after disassembling the process end cover;

[0032] Figure 4 This is a schematic diagram of all rotating components of this solution;

[0033] Figure 5 It is a cross-sectional view after improving the cooling air duct;

[0034] Figure 6 It is a schematic diagram of the internal air duct of the propeller. Detailed implementation manners

[0035] The present invention will be further described below with reference to the accompanying drawings.

[0036] As shown in Figures 1 to 6 , the shaft-through marine permanent magnet shaft generator includes a concentric generator stator housing 2, a generator stator winding 3, a generator permanent magnet rotor 11, a cylindrical rotor bracket 9, and a central rotating shaft 4; the generator stator winding 3 is coaxially fixed to the inner wall of the generator stator housing 2, and the generator permanent magnet rotor 11 is coaxially fixed to the outer wall of the cylindrical rotor bracket 9; a flange ring wall 7 is integrally provided on the inner wall of the cylindrical rotor bracket 9; a stator-rotor chamber 40 is formed between the generator stator housing 2 and the cylindrical rotor bracket 9.

[0037] A flange plate 6 is integrally coaxially provided in the middle of the central rotating shaft 4, and a flange plate 8 and a flange plate 5 are integrally coaxially connected to both ends of the central rotating shaft 4 respectively; in order to easily pass through during assembly, the outer diameters of the flange plate 8 and the flange plate 5 are both smaller than the inner diameter of the flange ring wall 7.

[0038] As shown in Figure 4 , 5 , 6 further includes a diesel engine output shaft 30 and a propeller shaft 33. The output end of the diesel engine is drivingly connected to the diesel engine output shaft 30. A flange plate 31 is integrally coaxially provided at the end of the diesel engine output shaft 30. A flange plate 32 is integrally coaxially provided at one end of the propeller shaft 33, and the other end is connected to the propeller unit 23; the flange plate 8 and the flange plate 31 are coaxially and synchronously connected by a plurality of flange bolts; the flange plate 5 and the flange plate 32 are coaxially and synchronously connected by a plurality of flange bolts; the flange plate 6 and the flange ring wall 7 are coaxially and synchronously connected by a plurality of flange bolts.

[0039] At both ends of the inner wall of the generator stator housing 2, there are end cover installation internal stop mouths. At both ends of the generator stator housing 2, two inner support ring end covers 1 are coaxially arranged. The outer rings of the two inner support ring end covers 1 are respectively snapped into the internal stop mouths at both ends of the inner wall of the generator stator housing 2 and are in interference fit; the inner rings of the inner support ring end covers 1 are coaxially fixedly connected with a copper ring 51 through a flange. A gap of 1 ± 0.25 mm is formed between the inner ring of the copper ring 51 and the outer wall surface of the cylindrical rotor bracket 9; several ventilation holes 12 are hollowed out on the inner support ring end covers 1. There are a cooling water inlet interface 60 and a cooling water outlet interface 61 on the generator stator housing 2. There is a cooling water channel in the generator stator housing 2. The two ends of the cooling water channel are respectively communicated with the water inlet interface 60 and the cooling water outlet interface 61. Under high load conditions, cooling water can be pumped from the water inlet interface 60 into the generator stator housing 2 through an external water pump to achieve the effect of forced heat dissipation.

[0040] Such as Figure 1 and 2 , it also includes two annular process end covers 10 that can be installed at both ends of the generator stator housing 2. The function of the two annular process end covers 10 is in the assembly process. In the normal use state, the two annular process end covers 10 are in the removed state. Inner ring flange holes 10.1 and outer ring flange holes 10.2 are respectively arranged on the inner and outer rings of the annular process end covers 10; the outer ring flange holes 10.2 on the outer ring of the annular process end cover 10 are detachably locked at the end of the generator stator housing 2 through flange bolts; the inner ring flange holes 10.1 on the inner ring of the annular process end cover 10 are detachably locked at the end of the cylindrical rotor bracket 9 through flange bolts.

[0041] Improvement of the cooling system in this solution ( Figures 1 to 3 does not involve the improvement of the cooling system):

[0042] Such as Figure 5 and 6 shown, several cold air outlet ports 13 are distributed on the outer wall surface of the cylindrical rotor bracket 9. The several cold air outlet ports 13 are circumferentially arrayed at both ends of the generator permanent magnet rotor 11 and are all communicated with the stator-rotor chamber 40;

[0043] Several a gas centrifugal channels 24 extending in the radial direction are circumferentially arrayed inside the a flange plate 6. Several b centrifugal channels 14 are circumferentially arrayed inside the integral structure formed by the cylindrical rotor bracket 9 and the flange ring wall 7. One end of each of the several b centrifugal channels 14 far from the axis of the cylindrical rotor bracket 9 is respectively communicated with the stator-rotor chamber 40 through several cold air outlet ports 13. In the state where the a flange plate 6 and the flange ring wall 7 are tightly connected through a flange, one end of each of the several a gas centrifugal channels 24 far from the axis of the a flange plate 6 respectively corresponds to and communicates with one end of each of the several b centrifugal channels 14 close to the axis of the cylindrical rotor bracket 9.

[0044] At the axis center inside the flange 6, there is a ring-shaped gas distribution chamber 17 coaxially arranged. One end of several gas centrifugal channels 24 close to the axis center of the flange 6 is connected to the ring-shaped gas distribution chamber 17. Inside the central rotating shaft 4, there is an intake channel 15 arranged along the length direction. One end of the intake channel 15 close to the flange 8 is connected to the external atmospheric pressure through the air inlet 23; inside the propeller shaft 33, there is an intake channel 19 arranged along the length direction. When the flange 5 and the flange 32 are tightly connected by the flange, one end of the intake channel 15 close to the intake channel 19 is connected to each other.

[0045] Inside the propeller shaft 33, there is an intake channel 20 arranged along the length direction and parallel to the intake channel 19. Inside the central rotating shaft 4, there is an intake channel 16 arranged along the length direction and parallel to the intake channel 15. When the flange 5 and the flange 32 are tightly connected by the flange, one end of the intake channel 20 close to the intake channel 16 is connected to each other.

[0046] Inside the propeller hub or the propeller blade 22 of the propeller unit 23, there is a zigzag gas cooling channel 21 arranged. One end of the intake channel 19 and the intake channel 20 close to the propeller unit 23 are connected to each other through the zigzag gas cooling channel 21.

[0047] Working principle of the cooling system:

[0048] During operation, the diesel engine drives the output shaft 30 of the diesel engine, which in turn drives the central rotating shaft 4 and the propeller shaft 33 to rotate synchronously, so that the propeller unit 23 stirs in the water, and then drives the hull to move forward. At the same time, the rotation of the central rotating shaft 4 will drive the cylindrical rotor bracket 9 and the generator permanent magnet rotor 11 to rotate rapidly, so that the coils on the generator stator winding 3 cut the magnetic induction lines to generate electricity, and continuously generate induced current, so as to generate electricity while driving the hull to move forward. During the power generation process, the current in the motor stator winding 3 generates heat due to the thermal effect, and will increase the temperature in the stator-rotor chamber 40, thus inhibiting the power generation power; at the same time, due to requirements such as rain protection, the device and the diesel engine are both arranged in an independent small-volume cabin in the same space. Due to its own heat dissipation and the heat dissipation of the diesel engine, the ambient temperature where the generator is located is relatively high, so the heat dissipation capacity of the motor stator winding 3 is limited.

[0049] In this case, during the high-speed rotation of the cylindrical rotor bracket 9 and the permanent magnet rotor 11 of the generator, a swirling gas rotating around the axis is formed in the stator-rotor chamber 40, so that the air at several cold air outlets 13 on the outer peripheral wall of the cylindrical rotor bracket 9 has the characteristic of high flow velocity. According to fluid mechanics (Bernoulli's equation), under the same conditions, the higher the flow velocity, the lower the air pressure. Furthermore, the stator-rotor chamber 40 with high internal flow velocity generates a certain suction force on several cold air outlets 13. At the same time, during the synchronous rotation of the a flange 6 and the cylindrical rotor bracket 9 along the axis, the air in several a gas centrifugal channels 24 and b centrifugal channels 14 flows centrifugally away from the axis of the cylindrical rotor bracket 9 under the action of centrifugal force. Therefore, under the combined conduction of the centrifugal force received by the air inside several a gas centrifugal channels 24 and b centrifugal channels 14 and the certain suction force generated by the stator-rotor chamber 40 with high internal flow velocity on several cold air outlets 13, a continuous negative pressure is formed in the annular gas distribution chamber 17. Furthermore, the negative pressure is finally transmitted to the air inlet 23, and the following gas cycle is formed:

[0050] The indoor relatively high-temperature air in the cabin is sucked into the a air inlet channel 15 through the air inlet 23 under the action of negative pressure. Subsequently, the air entering the a air inlet channel 15 flows through the b-section air inlet channel 19, the zigzag gas cooling channel 21, the c-section air inlet channel 20, the d-section air inlet channel 16, the annular gas distribution chamber 17, several a gas centrifugal channels 24 and several b centrifugal channels 14 in sequence, and is finally blown out to the stator-rotor chamber 40 through several cold air outlets 13. At the same time, the excess air in the stator-rotor chamber 40 is discharged from the cabin again through several ventilation holes 12 on the two inner support ring end caps 1. Furthermore, a continuous above-mentioned gas flow cycle is formed;

[0051] Since the propeller unit 23 continuously stirs in the water, the heat of the propeller blades 22 on the propeller unit 23 will be quickly transferred to the water, so as to dissipate heat quickly. During the above gas flow cycle, when the relatively hot air from the cabin flows through the zigzag gas cooling channel 21 inside the propeller blades 22, the propeller blades 22 will quickly take away the heat, so as to cool down. Furthermore, during the above cycle, the air continuously blown out to the stator-rotor chamber 40 through several cold air outlets 13 is the relatively cold air that has been efficiently cooled by the propeller blades 22. Thus, during the operation of the machine, the stator-rotor chamber 40 of the device is continuously supplemented with cold air, which significantly promotes the cooling and heat dissipation of the motor stator winding 3 and the stator-rotor chamber 40.

[0052] Assembly process:

[0053] Step 1, the generator stator winding 3 has been fixedly installed on the inner wall of the generator stator housing 2 in the initial state. Then, the outer ring of an inner support ring end cap 1 is coaxially knocked into the inner stop of the inner wall of any end of the generator stator housing 2 and locked;

[0054] Step 2: Take the side where one inner support ring end cover 1 has been knocked in as the lower side, and place the generator stator housing 2 with the generator stator winding 3 already installed upright on the tooling tabletop.

[0055] Step 3: Lift the integral structure composed of the cylindrical rotor bracket 9 and the generator permanent magnet rotor 11 from above into the inner circle of the generator stator winding 3 until the lower end of the cylindrical rotor bracket 9 passes through the copper ring 51 inside the inner circle of the lower inner support ring end cover 1.

[0056] Step 4: Assemble and lock another inner support ring end cover 1 with a copper ring 51 from above by knocking it in.

[0057] Step 5: Turn over the assembled structure obtained in "Step 4" to the horizontal state.

[0058] Step 6: Lock the outer flange holes 10.2 on the outer circles of the two annular process end covers 10 to the two ends of the generator stator housing 2 through flange bolts in a detachable manner; at the same time, lock the inner flange holes 10.1 on the inner circles of the two annular process end covers 10 to the two ends of the cylindrical rotor bracket 9 through flange bolts in a detachable manner; at this time, the two annular process end covers 10, the generator stator housing 2 and the cylindrical rotor bracket 9 together form a fixed body that is strictly constrained with each other. Meanwhile, under the rigid constraint of the flange connection of the two annular process end covers 10, the generator stator housing 2 and the cylindrical rotor bracket 9 automatically enter the coaxial state, the inner circles of the copper rings 51 of the two inner support ring end covers 1 and the cylindrical rotor bracket 9 automatically enter the coaxial state, and a gap of 1 ± 0.25 mm is automatically formed between them; at the same time, the stator-rotor chamber 40 is closed by the two annular process end covers 10, and the protection level reaches IP55, which plays a role in waterproofing during subsequent hoisting and installation.

[0059] Step 7: Pass the central shaft 4 through the inner circle of the cylindrical rotor bracket 9, and then lock the a flange 6 and the flange ring wall 7 through several flange bolts; then prepare to lift it into a relatively airtight and rainproof cabin.

[0060] Step 8: Lock the b flange 8 and the d flange 31 coaxially through several flange bolts; lock the c flange 5 and the e flange 32 coaxially through several flange bolts; at the same time, adjust the position of the generator stator housing 2 adaptively.

[0061] Then remove the two annular process end covers 10, measure the gap between the inner circle of the copper ring 51 of the inner support ring end cover 1 and the cylindrical rotor bracket 9 at four positions of up, down, left and right in the circumference to see if the gap value is 1 ± 0.25 mm. If there is a deviation, it can be finely adjusted through the jacking screw holes on the machine base feet; after the measurement is qualified, firmly fix the generator stator housing 2.

[0062] Step Nine, when an extreme case of stator short circuit occurs, remove the bolts connecting the a flange 6 and the flange ring wall 7, axially push out the cylindrical rotor bracket 9 by 20 mm, and at this time the rotor is disengaged from the central rotating shaft 4.

[0063] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. Axial-through marine permanent magnet shaft generator, characterized in that: It includes a coaxial generator stator housing (2), a generator stator winding (3), a generator permanent magnet rotor (11), a cylindrical rotor bracket (9), and a central rotating shaft (4); The generator stator winding (3) is fixed to the inner wall of the generator stator housing (2), and the generator permanent magnet rotor (11) is coaxially fixed to the outer wall of the cylindrical rotor bracket (9); a flange ring wall (7) is integrally provided on the inner wall of the cylindrical rotor bracket (9); a stator-rotor chamber (40) is formed between the generator stator housing (2) and the cylindrical rotor bracket (9); a flange plate (6) is integrally coaxially provided in the middle of the central rotating shaft (4), and the flange plate (6) and the flange ring wall (7) are coaxially and synchronously connected by a number of flange bolts; Both ends of the central rotating shaft (4) are integrally and coaxially connected with a flange plate (8) and a flange plate (5) respectively; the outer diameters of the flange plate (8) and the flange plate (5) are both smaller than the inner diameter of the flange ring wall (7); It also includes a diesel engine output shaft (30) and a propeller shaft (33). A flange plate (31) is integrally coaxially provided at the end of the diesel engine output shaft (30). A flange plate (32) is integrally coaxially provided at one end of the propeller shaft (33), and the other end is connected to a propeller unit (23); the flange plate (8) and the flange plate (31) are coaxially and synchronously connected by a number of flange bolts; the flange plate (5) and the flange plate (32) are coaxially connected by flange bolts; Inner end stops for end cover installation are provided at both ends of the inner wall of the generator stator housing (2). Two inner support ring end covers (1) are coaxially provided at both ends of the generator stator housing (2). The outer rings of the two inner support ring end covers (1) are respectively snapped into the inner end stops at both ends of the inner wall of the generator stator housing (2); a copper ring (51) is coaxially fixed to the inner ring of the inner support ring end cover (1) through a flange, and a gap is formed between the inner ring of the copper ring (51) and the outer wall surface of the cylindrical rotor bracket (9); A number of ventilation holes (12) are hollowed out on the inner support ring end cover (1). A cooling water inlet interface (60) and a cooling water outlet interface (61) are provided on the generator stator housing (2). A cooling water channel is provided inside the generator stator housing (2), and both ends of the cooling water channel are respectively communicated with the cooling water inlet interface (60) and the cooling water outlet interface (61); The outer wall surface of the cylindrical rotor support (9) is distributed with a number of cold air outlets (13). The number of cold air outlets (13) is circumferentially arrayed at both ends of the generator permanent magnet rotor (11) and is communicated with the stator-rotor chamber (40); a number of a gas centrifugal channels (24) extending in the radial direction are circumferentially arrayed inside the a flange (6). A number of b centrifugal channels (14) are circumferentially arrayed inside the integral structure formed by the cylindrical rotor support (9) and the flange ring wall (7). One end of each of the number of b centrifugal channels (14) far from the axis of the cylindrical rotor support (9) is communicated with the stator-rotor chamber (40) through a number of cold air outlets (13). When the a flange (6) and the flange ring wall (7) are tightly connected by a flange, one end of each of the number of a gas centrifugal channels (24) far from the axis of the a flange (6) corresponds to and communicates with one end of each of the number of b centrifugal channels (14) close to the axis of the cylindrical rotor support (9); a ring-shaped gas distribution chamber (17) is coaxially arranged at the axis center inside the a flange (6). One end of each of the number of a gas centrifugal channels (24) close to the axis of the a flange (6) is communicated with the ring-shaped gas distribution chamber (17). An a-section air inlet channel (15) is arranged along the length direction inside the central rotating shaft (4). One end of the a-section air inlet channel (15) close to the b flange (8) is communicated with the outside atmospheric pressure through an air inlet; a b-section air inlet channel (19) is arranged along the length direction inside the propeller shaft (33). When the c flange (5) and the e flange (32) are tightly connected by a flange, one end of the a-section air inlet channel (15) and one end of the b-section air inlet channel (19) close to each other are communicated with each other; a c-section air inlet channel (20) parallel to the b-section air inlet channel (19) is arranged along the length direction inside the propeller shaft (33). A d-section air inlet channel (16) parallel to the a-section air inlet channel (15) is arranged along the length direction inside the central rotating shaft (4); when the c flange (5) and the e flange (32) are tightly connected by a flange, one end of the c-section air inlet channel (20) and one end of the d-section air inlet channel (16) close to each other are communicated with each other; A zigzag gas cooling channel (21) is arranged inside the propeller hub or the propeller blade (22) of the propeller unit (23). One end of the b-section air inlet channel (19) and one end of the c-section air inlet channel (20) close to the propeller unit (23) are communicated with each other through the zigzag gas cooling channel (21).

2. The shaft-through marine permanent magnet shaft generator according to claim 1, wherein: In the non-use state, it further includes a ring-shaped process end cover (10) that can be installed at both ends of the generator stator housing (2). Inner ring flange holes (10.1) and outer ring flange holes (10.2) are respectively arranged on the inner and outer rings of the ring-shaped process end cover (10); the outer ring flange holes (10.2) on the outer ring of the ring-shaped process end cover (10) are detachably locked at the end of the generator stator housing (2) through flange bolts; the inner ring flange holes (10.1) on the inner ring of the ring-shaped process end cover (10) are detachably locked at the end of the cylindrical rotor support (9) through flange bolts.

3. The assembly process of the shaft-through marine permanent magnet shaft generator according to claim 2, characterized in that: Step 1: Knock the outer ring of an inner support ring end cover (1) coaxially into the inner stop of the inner wall at any end of the generator stator housing (2). Step 2: Take the side where an inner support ring end cover (1) has been knocked in as the lower side, and place the generator stator housing (2) with the installed generator stator winding (3) vertically on the tooling tabletop. Step 3: Lift the integrated structure composed of the cylindrical rotor bracket (9) and the generator permanent magnet rotor (11) from above into the inner ring of the generator stator winding (3) until the lower end of the cylindrical rotor bracket (9) passes through the copper ring (51) inside the inner ring of the lower inner support ring end cover (1). Step 4: Assemble another inner support ring end cover (1) with a copper ring (51) from above. Step 5: Turn the assembled structure obtained in "Step 4" to the horizontal state. Step 6: Lock the outer flange holes (10.2) of the outer rings of the two annular process end covers (10) to both ends of the generator stator housing (2) detachably through flange bolts; at the same time, lock the inner flange holes (10.1) of the inner rings of the two annular process end covers (10) to both ends of the cylindrical rotor bracket (9) detachably through flange bolts; at this time, the two annular process end covers (10), the generator stator housing (2) and the cylindrical rotor bracket (9) together form a fixed body that is strictly constrained with each other. Meanwhile, under the rigid constraint of the flange connection of the two annular process end covers (10), the inner rings of the copper rings (51) of the two inner support ring end covers (1) and the cylindrical rotor bracket (9) automatically enter the coaxial state, and a 1 ± 0.25 mm gap is automatically formed between them; at the same time, the stator-rotor chamber (40) is closed by the two annular process end covers (10), and the protection level reaches IP55. Step 7: Pass the central rotating shaft (4) through the inner ring of the cylindrical rotor bracket (9), and then lock the a flange plate (6) and the flange ring wall (7) through several flange bolts; then prepare to lift it into the cabin. Step 8: Lock the b flange plate (8) and the d flange plate (31) coaxially through several flange bolts; lock the c flange plate (5) and the e flange plate (32) coaxially through several flange bolts; at the same time, adjust the position of the generator stator housing (2) adaptively; then disassemble the two annular process end covers (10), and measure the gap between the inner ring of the copper ring (51) of the inner support ring end cover (1) and the cylindrical rotor bracket (9) at 4 positions in the circumferential up, down, left and right directions. If there is deviation, it can be finely adjusted through the jacking screw holes on the machine base feet; after the measurement is qualified, firmly fix the generator stator housing (2). Step 9: In the extreme case of stator short circuit, remove the bolts connecting the a flange plate (6) and the flange ring wall (7), and axially push out the cylindrical rotor bracket (9) by a certain distance. At this time, the rotor is disengaged from the central rotating shaft (4).

Images